<h2>{{hero.name | uppercase}} Details</h2>
<div><span>id: </span>{{hero.id}}</div>
<div><span>name: </span>{{hero.name}}</div>

<!-- 双向绑定 -->
<div>
  <label>name:<!--阿萨德-->
    <input [(ngModel)]="hero.name" placeholder="name">
  </label>
</div>
